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"I came home from lunch and the street was cordoned off, we didn't know what was going on so we locked all the doors, but when he was led out we watched through the screen door," the neighbour told The Age.

They added they had never seen Hunter before and suggested he may have been staying with a friend or relative when he was arrested.

Another neighbour of Hunter's told Nine News his behaviour was strange.

"He was really weird," Rami Masri said.

"Every time he shut the door he'd have a look around."

Police had sealed off a rear lane in the quiet street and the entire operation took around 10 minutes.

Undercover officers dressed as tradesmen mobilised for action when police arrived in four-wheel drives and on motorbikes.

A man who lives in the same block of flats where Hunter was staying said he thought it was strange when a neighbour would not let him in his home last night.

The man, who only wanted to be identified as Rod, said the neighbour phoned him this morning and told him not to approach his apartment.

Facebook's public "R.I.P Sarah Cafferkey" page has more than 27,700 'likes' on Tuesday.

Many posters mourned the death of a beautiful young woman they never knew, while others voiced despair that the tragedy came soon after the September rape and murder of Brunswick woman Jill Meagher.

Others, though - as with Ms Meagher's case - wanted blood as soon they had a suspect's name.

Police have warned the public against making malicious comments as they announced their arrest.

"The community is reminded that comments on social media sites may potentially affect the outcome of court matters relating to this investigation," a police statement said.

"We request people refrain from posting hateful or inciteful comments on these sites."